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Hello,
I have a very rudimentary knowledge of plumbing but I've watched a fair amount of DIY winterizing videos and from what I have seen by taking a look around my home, these four pictures are all of the potential plumbing sites for the sprinklers. I don't see any of the typical devices where there would be the ball valves and hook up sites. I have a 4 zone system (picture 3) and from what I can tell there isn't any areas within that box to hook it up. The two pics (1,2) with the PVC are right beside the manifold and of the two vertical pipes, one I believe is there just to run a wire up. I suspect this is the part I hook my compressor to (just undo the cap?), but it doesn't have the typical RP or PVB system. The last pic is the main line from the city and the split. I honestly don't know for sure what the smaller copper/plastic pipe is, drainage? But I suspect that the ball valve is the shut off to my sprinkler system. Please lend me some help I would appreciate it so much. In pic 4, the pipes go into the studs and there isn't any part with a valve or hidden attachments as far as I can see.